A METHOD AND A DEVICE FOR THE REGISTRATION OF A VEHICULE IN A ROAD TOLL

Abstract: Registering of vehicles in a road toll facility provided with radio transmitter and receiver equipment (7) for microwaves arranged to communicate with vehicle units (12) provided in the vehicles (4), preferably with a transponder. On command from the road toll facility, identity is obtained from the road toll facility and a toll debiting operation is performed. When a vehicle (4) enters the toll facility it is detected by means of the activation of the toll facility radio equipment (7) if the vehicle (4) is provided with a vehicle unit (12) and if it is in function for the performance of a correct payment maneuver. Vehicles for which such cannot take place are exposed to a successive position determination by means of video cameras (9) through an image processing in which the vehicle in question is tracked between a predetermined recording site and the position where the payment status of the vehicle has been established by means of the radio equipment. In the recording site the number plate of the vehicle is recorded for identification by means of a video camera (10), which identification in conjunction with data such as time and place is used for search and for post-debiting of the toll.

Description: A METHOD AND A DEVICE FOR THE REGISTRATION OF A VEHICLE IN A ROAD TOLL TECHNICAL FIELD The present invention relates to a method and device for registering vehicles in a road toll facility. More specifically, the invention relates to a method and device in such road toll facilities, where fee debiting can take place through wireless transmission of radiowaves between vehicles and equipment in the road toll facility, respectively, and specially intended are such road toll facilities that are arranged to enable a free traffic flow through the toll facility. BACKGROUND It is known to arrange road toll facilities for automatic fee debiting, see for example US, A, 4,104,630 and US, A, 4,303,904. Such systems to which the present invention refers, provide that the ma¬ jority of vehicles that pass the road toll facility, are provided with a receiver-transmitter unit for radiowaves. Usually microwaves are under¬ stood. The road toll facility comprises an arrangement by which commu¬ nication by radiowaves can take place with passing vehicles. This arrange¬ ment comprises a transmitter and receiver, a transceiver, for the radio- waves by means of which equipment payment and debiting operations can be carried out for the passing vehicles provided with said receiver and transmitter unit, which unit usually has the form of a transponder. For this technique compare US, A, 4,075,632 and US, A, 4,242,661 for example. However, it may occur, that the toll facility is passed by vehicles which are not provided with any receiver and transmitter equipment and therefore cannot be identified by means of the radiowaves. For identi¬ fication of such vehicles, if these attempt at passing the toll facility without paying toll, the toll arrangement is provided with camera devices for image registration of the number plates of the vehicles in question for search .and post-debiting. The most advanced system for road tolls of this kind is adapted to a great flow of traffic in free formation. In such an arrangement it will be possible to for the vehicle to travel a certain distance from the time when a registration has been possible to carry out of whether the vehicle is identifiable through microwaves or not and until the recording operation regarding the number plate has been concluded. During this displacement a separation must be maintained between such vehicles for which search and post-debiting shall take place, and such for which payment has been secured by means of the radio cαmπunication. This requires additionally that the toll arrangement is provided with an equipment for positioning detection also when the vehicles travel in free flow without determined lanes. DESCRIPTION OF THE INVENTION In the invention, it is described partly a method and partly a combination of device, which enable said detection and performance of payment ope¬ rations for such vehicles which are provided with authorized equipment as well as registration by means of recording of the number plate of such vehicles for which no approved payment operation has been possible to perform during the passage through the toll facility. According to the invention, for the latter operation, the image recording by means of video cameras is utilized for the tracking of the vehicles for which a recording of the number plate shall be registered, so that safety is obtained that the same vehicle which on passing through the toll facility has been established to lack acceptable payment status can be connected with a registered recording before exiting the toll facility and thereby is assigned to the identity that was given to the vehicle on its entry. DESCRIPTION OF THE DRAWINGS In the accompanying drawings a preferred embodiment of the invention is illustrated, wherein Fig. 1 shows in perspective a road toll arrangement; and Fig. 2 shows a block diagram for the main elements of function of the road toll system; PREFERRED EMBODIMENT According to Fig. 1 an automatic road toll facility according to the invention is provided with a support 1, which extends above a road 2, which has three lanes 3 in which vehicles 4 of different kinds can proceed through the portal-like gantry 1. The traffic is not limited to keeping the lanes under the gantry but is allowed to perform lane changes and over-takings. It is thus a free-flow system, which as little as possible shall disrupt the traffic flow. On the gantry, there are attached two light fittings 6 and a number of transmitter and receiver units 7 for microwaves, three of which are shown here, including antennae for these. In addition, there is on either side a video camera 8, directed at the approaching traffic flow to register vehicles which unpermittedly are driven on the verge. In addition, at the top center of the gantry, video cameras 9 are shown. A a lower level, cameras are shown in three pairs of video cameras 10 directed forwards and backwards, respectively. These cameras are located approximately at the centre of the three lanes 3, respectively. All this equipment is connected to a computer unit 11 for the control of same and for processing recorded data. This unit is in turn connected to a central net for further ccmπunication. The main functions and function units of the arrangement are schematically represented in the block diagram in Fig. 2. Therein, 12 designates the equipment understood to be provided in the majority of vehicles 4. Such an equipment is understood to be a transponder 13, which is arranged to pick up microwaves and transform them into an answer signal comprising information enabling a payment operation for the vehicle, and in addition, an intelligent card 14 for transmitting data via the transponder, which data, in addition to certain identification data, may consist of data regarding payment conditions (whether debiting shall occur or whether pre-payment via a pay card has been made). Other elements in the block diagram relate to the stationary equipment. On the gantry there are located the transmitter and reciever equipment 7 for microwaves, video cameras 8 and 9 as well as the three pairs of video cameras 10 (only one pair of which is shown) , which all are identified by the same numbers in the block diagram. Other elements belong to said equipment with which the equipment on the support communicates. This equipment can comprise said computer unit 11 for checking the equipment and a central unit 16. The equipment for checking the vehicles which are not provided with any vehicle unit 12-14 with which payment can be ensured and for which there is a need for identi¬ fication in another way, and examination for post-debiting, comprises the cameras 9 and 10 and belonging image processing computer which can be included in the unit 11. This unit is connected to the video cameras 9 for the registration of the position and displacement of the vehicles that shall be checked particularly. To the video cameras 10 there are connected a unit for controlling the exposure of the vehicles whose number plate or other characteristic shall be registered, and a unit for collecting the registered video images and compression and storing of same. These images can via the unit 11 be communicated to the central arrangement 16 for post-processing in connection with search and post- debiting of vehicles that passed without paying. Finally, there is a comπunication unit 17 for ccππiunication with said central arrangement for the exchange of traffic information etc. The vehicle equipment unit 12 comprises an apparatus in a box, which shall be attached for example at the windscreen of the vehicle. The box comprises a small, inbuilt transponder antenna, and interacting electronics, comprising a safety module. The apparatus box is furthermore provided with a character display and a simmer. The vehicle unit enables a double directed microwave comπunication with the toll facility trancievers 7, which are part of the fixed equipment. In addition, the vehicle unit is arranged to operate with a pre-paid card, smart card, which can be inserted in the apparatus box for payment of the road tolls. Every owner of a vehicle within the area where road tolls are collected is provided with an identification card for the vehicle, which comprises all vehicle data necessary for the electronic toll system. Pre-payment means that a customer has paid for a service or product before delivery of the service or product. Drivers who use a smart card or a pre-paid account intended for road tolls have subscribed to the pre-payment method. This method represents a convenient mode of payment for the user. By the arrangement the fee is automatically subtracted from the remaining amount on the pre-paid card when the vehicle passes through en electronic toll station. To increase the debitable amount available, "money" can be transferred at a sales station. The pre-payment card is the same size as a credit card. It comprises an integrated circuit with a microprocessor and a safety module. The safety module is a section designed to protect the data stored in the card. The manufacturer of such a smart card shall follow the highest international safety rules in the manufacturing process and in the construction of the integrated circuits. Such a smart card can store not only different kinds of information including electronic money, but also safety information against loss, damage and theft. The vehicle driver inserts his card in the vehicle unit, which thereby indicates the remaining amount on the display. A certain predetermined amount is thereafter transferred automatically from the card to the safety module in the vehicle unit. Now, the vehicle unit is ready safely to perform a code controlled payment to the respective toll facility. The summer in the vehicle unit is activated when payment has been made as an acknowledgement to the driver that the road toll has been paid at the electronic road toll facility. The vehicle unit also includes a unique identification number. It is thus fully possible that tolls are drawn frcm an account related to the unique number of the vehicle unit. If desired, the vehicle unit can thus function completely without a smart card provided that the current identification number has been transmitted to the unit and stored in the safety module. Drivers who have registered such a unique number for their vehicle unit can always choose to pay by using a pre-paid card or by drawing the toll from the account connected to the vehicle unit. It is essential to point out that the central system need not be informed of the mode of payment chosen. The driver can entirely decide at each time how he prefers to pay. If he wishes to pay with a smart card, he only inserts this card, which shall contain sufficient amount, into the vehicle unit. If he prefers not to use the card it is not inserted. The mode of payment that is the safest and requires the least amount of data ccmmunication is pre-payment by means of a pay card. With current technique it is however not possible to perform a debiting on the pay card in the short time when the cαππunication between the transponder and the transmitter-receiver equipment of the road toll facility occurs. According to a preferred embodiment, this problem is overcome in that, when a pay card is inserted into the vehicle communication equipment its content or a determined amount is loaded into a memory directly connected to the transponder, which memory can be included in the safety module. Hereby, the debiting operation can be carried out in the short time that is available. Then, the procedure will be such that when the card is inserted into the vehicle equipment, a determined amount is transferred frcm the pay card to the transponder memory safety module. During use, a warning is given in the form of a light or sound signal when only a small pre¬ determined amount remains stored in the memory. When the user removes the card, he is made aware of the possibilities, for example by means of a display, of re-feeding the money to the pay card within a specified period of time. An alternative to the above is that the payment transaction between the transponder and the pay card can be carried out after passage through the toll facility. Violation is dealt with at some subsequent toll station. The pay card can be designed with an identification connected to a certain person or company, so that the amount fed into the transponder memory can be kept in reserve if for a time somebody else with his own pay card uses the vehicle. The pay card can be designed as an intelligent card (Smart Card) with memory and processing unit for other purposes than as a pay pard only. The vehicle unit can also be designed so that in its memory information is registered with regard to a number of the latest used pay cards/in¬ telligent cards so that separate information on the transactions is safely recorded, in the event a card should be lost or beccme unusable. Correspondingly, an intelligent card can store information on identities in the toll facilities where debiting on the card has occurred. The stationary equipment, the toll system, is arranged for communication between the vehicle equipment and the equipment in the road toll facility. The latter comprises in addition to other components, antennae with controlled range, a detector system for the vehicles, and the video system for recording vehicles that shall be registered particularly, and includes a computer system. The antennae are required for communication with the vehicle units and for measuring their position. The video control system is necessary for detecting and tracking vehicles without vehicle units, as these vehicles are "invisible to the antennae". The video system is designed to record in video every vehicle that has not shown a correct payment status or has driven through the toll station without having been detected by means of radio communication. The computer system ensures processing of data in real-time including interaction of the electronic units, and also communication with the central facility, however not always in real-time. The antennae with short range are mounted on the support 1 above the roadway. They emit microwaves, which activate the vehicle unit when this comes into the ccmmunication zone, that is within the operational range of the road toll facility. The activated vehicle unit answers by transmitting modulated waves, which are picked up by the antennae. Vehicles not provided with a vehicle unit with transponder are thus detected, and also the position of the vehicle is measured by means of a multi-antenna system. Vehicles that show correct payment at the current moment can therefore be selected out from other vehicles. Certain vehicles can however completely lack vehicle units while others do not have access to sufficient means of payment for the current situation, whether payment shall be made through a smart card or through a connected account. For the vehicles that have not shown a correct transaction, a video recording shall be registered before they leave the toll facility. This recording system is needed to prevent that vehicles that have not fulfilled a correct payment operation leave the toll facility, without evidence having been secured by means of which legal measures can be taken. Consequently, every vehicle that has not fulfilled a correct payment, will be registered in the road toll facility by means of the video cameras for recording their identity. The image of the vehicle number plate of the presumptive rule violator is temporarily stored in compressed form in a mass storing memory in the computer system. Certain information, such as the kind of rule violation and the point of time when the vehicle is recorded, is stored together with the image. These data are transferred at a later, appropriate time as a greater amount of data to the central facility. As mentioned, recording of vehicles that pass the road toll facility without being possible to identify for a correct payment operation, requires that after having established that such a vehicle has passed, it shall be identified through video recording of its number plate. This makes it necessary that the vehicle in question is tracked between the place in which the non-approved passage has been established and the place where recording takes place, so that no confusion between vehicles with authorized and vehicles with non-authorized passage occurs. According to a preferred embodiment this is performed in the following way: 1. When a vehicle approaches the road toll facility this is indicated for "wakening" the apparatus in the road toll facility. This is effected by microwaves frcm the transmitter-receiver units 7. 2. The video detection equipment comprising the cameras 9 registers all the vehicles on their way in under the gantry 1. These cameras operate thereby with high contrast and give a clear contour for all the vehicles. These contour images are data processed and thereby an initial position for the vehicles that are recorded by the cameras can be established. 3. In connection with the indication, by means of the microwaves, that a vehicle is approaching and this in connection hereto is detected by the video detection equipment the vehicle is recorded by means of the cameras 10. In the embodiment shown in Fig. 1, first the front number plate is recorded by any of the cameras facing the traffic flow and after the vehicle has passed under the gantry and a distance away from it the rear number plate is recorded by one of the cameras turned in the direction of the traffic flow. The respective recordings are assigned to the vehicle that is located in recording position when the recordings are made, which is ensured in that the video detection equipment triggers the recording when the respective vehicle has been detected to be located in a determined recording site, which has been registered by this equipment. 4. The position of the vehicle is measured against the vehicle unit 12 by means of the transmitter-receiver equipment 7, which in each unit has three reciever elements. The phase position in the signal from the various elements are compared, by which the direction and position of the vehicle can be calculated. This position determination is related to the vehicle unit with its transponder being the measured object. 5. The payment operation is performed. Thereby, it is communicated on command frcm the microwave unit 7 in question in the toll facility, the amount and information related thereto such as time and the toll facility identity, which signal is to be picked up by the tran¬ sponder and processed in the vehicle unit. Through modulation of the signal reflected from the transponder to the microwave transceiver in the toll station, it is indicated whether a correct payment operation has been performed. 6. The position determinations by means of the radiowaves frcm the receiver-transmitter equipment for vehicles with a transponder is processed together with the position determinations with the aid of the video detection equipment, that is the contour images. Thereby, a dialogue takes place between the two positioning systems. 7. Vehicles that have been identified with their transponder are registered further if correct payment conditions are at hand. As mentioned in the introduction, payment can be made in different ways, for example, through subtraction from a pay card in the vehicle via the transponder or other receiver-transmitter equipment or through debiting to an account agreed. Through said measures there is now established a classification of the vehicles in three head classes: - Vehicles provided with a transponder for which a correct payment manouever can be performed; - Vehicles with a transponder but for which acceptable payment conditions are not at hand; and - Vehicles without a transponder, which therefore cannot be detected by the transmitter-receiver equipment of the road facility. As to the first class, these vehicles can pass without further measures and there is no interest in establishing the identity. Generally it is provided that vehicles, for which correct payment operation can be performed, shall be anonymous with regard to the toll facility passage. Vehicles of the second class can, per se, be identified through the transponder, so that a post-debiting can occur if an approved payment condition should momentarily not be established, for example in that a pay card has not sufficient amount left or an account has been frozen. For vehicles of the third class, however, identification must take place through recording of the number plate. Vehicles of the second class can also be treated in this way as an alternative or complementary measure to identification via the transponder. 8. Those vehicles whose number plate shall be identified through recording by means of the cameras 10 shall now be tracked between the position where the recording is performed and the position where checking the payment status and in cases as may be if payment has been made. This position tracking occurs through data processing of the initial contour recording of the displacement within the recording field of the video contour cameras 9. This means that for every contour line or contrast field used for the tracking, a number of related co-ordinates are registered, which represent the identity of the vehicle. In data processing the displacement of these co-ordinates within the image field can be tracked for new successive position designations. 9. When the respective vehicle has reached the place where the operation for checking the payment status and in cases as may be the payment operation have been performed, those recordings which have been as¬ signed to vehicles for which the payment operation has been carried out are deleted. The identity of these vehicles can be determined through the dialogue between the equipment that by means of the radiowaves serves to perform the payment operation and that simul¬ taneously by means of said antenna arrangement tracks the displacement of the vehicle with the aid of the vehicle transponder. This occurs in co-operation with the video detection equipment, which tracks the vehicles with great accuracy frcm the recording site to said point where the payment operation shall be concluded. For other vehicles, which have not fulfilled any payment, recording shall be registered together with data such as the identity of the toll facility and the time. If the vehicle has a transponder but in spite of this fact no approved payment operation has been performed, it can be tracked in the same way as described above. Vehicles which lack activatable transponder are, however, tracked only with the video detection equipment, and correct assignment of the recording and thereby the identity to data for the event can thus occur. 10. Recordings, which are obtained through the storing of the image recorded by the camera in the exposure position, for example in a video recorder or on a data disc, are now connected with the iden¬ tification that is obtained by the aid of the momentary position in the moment of exposure for the co-ordinates that have been re¬ gistered after having been produced in the image field of the video detection cameras 9. Consenquently, a mutual data processing must be performed of the registration, which is obtained in the video cameras 10 through the recording and the location of the respective cameras, and the position determination, which is obtained through the video detection cameras 9 in conjunction with the microwaves when the vehicle has a transponder. Hereby, it is ensured that it is in fact a vehicle which unauthorizedly has passed the toll facility, whose number plate has been recorded. Hereby, it can be avoided that vehicles which authorizedly has passed the road facility, are exposed to search and post-debiting because of confusion with un¬ authorizedly passing vehicles, due to repositionings in the distance between the points where video recording takes place and where the checking/payment operation is concluded. In the embodiment it is understood that all vehicles that pass into the operational range of the toll facility are recorded and that thereafter only those recordings are permanently registered which can be assigned to vehicles for which no correct payment operation has been performed. However, alternatively, it is possible to register only those vehicles for which no correct payment operation has been performed. Then, however, the recording must take place when the vehicle has passed the distance in which the microwave communication performs the check of the payment status. This point corresponds with the in section 9 above mentioned point in which according to the preferred embodiment the recordings that shall be permanently registered, are separated from those that shall be deleted. Even if such an alternative is fully possible, it will mean that the equipment in the toll facility is divided in two arrangements, one with the equipment for the microwave communication and video detection equipment and a second with the recording equipment; in practice two gantry devices. Frcm a constructional point of view the preferred embodiment will therefore be more advantageous and is therefore the embodiment preferred. Even if it is here understood the recording of an image of the number plate or other characteristic, it does not exclude that recording can take place in any other way, for example through reading of the number code of the plate or other code. It can be mentioned that in the preferred embodiment, the radio equipment does not need to track the displacement of the vehicle but only initially establish a position, which has been correlated to a corresponding position established by means of the video cameras. Thereafter, tracking can occur by means of the cameras only with identification of the vehicle on the basis of an identity alotted to it in the registering of the initial position. In order to make certain that a contour of the respective vehicle detect¬ able for the data processing can be registered by the video detection cameras, special arrangements can be of help. So, illumination can be used, preferably with IR light from suitable angles. Under certain con¬ ditions, it may be suitable to have supporting sensors such as magnetic loops, acoustic or optical arrangements. It may be suitable to provide the roadway with a layer, which facilitates the contour determination, such as a white field or a grid of lines. An alternative is also to achieve a grid under or about the vehicles with the aid of a number of laser light sources. It may be understood that for vehicles of different kinds, there are different fees such as higher fee for trucks than for passenger cars. It is thereby suitable that there is fed into the transponder data on fee class, so that a correct debiting can occur. In order to counteract that any one informs an incorrect fee class or given other faulty in¬ formation via the transponder, it may be appropriate to have checks in which the design of the vehicle is compared with the information from the transponder. This is suitably effected by means of the video detection equipment and, which in such case is arranged to determine data regarding the height, width and length of the vehicle etc.

Claims: Claims 1. Method for registering vehicles in a road toll facility, which is provided with radio transmitter and receiver units (7) preferably for microwaves, which are arranged to communicate with vehicle units (12) arranged in vehicles (4) , the vehicle units being arranged with the radio transmitter-receiver equipment preferably in the form of a transponder and arranged so that on command frcm the respective unit (7) of the road toll facility they ccππtunicate adequate data for the performance of a debiting operation regarding a toll, c h a r a c t e r i z e d in that, on the entry of a vehicle (4) into the toll facility area it is detected by means of the activation of the toll-facility radio equipment (7) if the vehicle (4) is provided with a vehicle unit (12) and if this is in function for the performance of a correct debiting operation, for separation of such vehicles for which such an operation cannot be performed; in that the radio equipment (7) is arranged to establish the position of the respective vehicles by means of radiowaves, at least in any position on its passing through the road toll facility; in that the vehicles are exposed to a successive position determination by means of video cameras (9) through an image processing in which the vehicle in question is tracked between a position in a predetermined recording site, in which the number plate or other characteristic of the vehicle is recorded/read for identification by means of at least one means arranged for said recording/reading, such as a video camera (10), which identification in conjunction with data such as time and place is used for search and post-debiting of the toll. 2. Method according to Claim 1, c h a r a c t e r i z e d in that, when the vehicle enters the toll facility area its mcmentary position is detected partly by measuring through the radio-transmitter-receiver unit (7) preferably for microwaves, partly through measuring to the vehicle unit of the vehicle (12) and partly by means of position determination with the aid of the video cameras (9) the results of which are correlated for the separation of vehicles not provided with any functioning vehicle unit (12) , for registering said recording and assigning it to the identity of the vehicle in question. A device for registering vehicles in a road toll facility for performance of the method according to Claim 1 or 2, which road toll facility is provided with a radio transmitter and reciever equipment (7) preferably for microwaves which is arranged to com¬ municate with vehicle units (12) arranged in vehicles (4) , arranged with radio transmitter-receiver equipment, preferably in the form of a transponder and arranged so that on command from the respective unit (7) of the road toll facility it communicates to it adequate data for performing a debiting operation regarding a toll, c h a¬ r a c t e r i z e d in that the radio equipment (7) with belonging computer equipment is arranged to separate out such vehicles for which a correct debiting operation by means of the vehicle unit (12) in question has been performed, from such vehicles for which an approved operation has not been performed; and in that the toll facility is provided with video cameras (9) and an image processing equipment connected to the cameras and, additionally, means for recording a code or other representation of the vehicle identity, such as cameras (10) for recording vehicles, preferably their number plates, the image processing equipment being arranged, by means of the image recording of the firstly mentioned cameras (9) , to track the vehicles (4) during their passage through the toll facility between a recording site for the latter video cameras (10) and a point in which the radio equipment (7) with belonging data equipment is arranged to indicate such vehicles for which an approved debiting operation has been performed, and additional means for the remaining registration of such recordings, which are assigned to vehicles for which an approved debiting operation has not been performed, but not to perform any such registration of vehicles for which an approved debiting operation has been indicated as performed. A device according to Claim 3, c h a r a c t e r i z e d in that the radio equipment (7) is arranged for the detection of the position of the respective vehicles (4) by means of the vehicle unit (12) in question and arranged to transmit to the image processing equipment the mcmentary position of the respective vehicle for said indication that an approved payment manouever has been carried out, and that the image processing equipment is arranged to receive said position indication and assign it to a vehicle in the corresponding momentary position in the detected displacement of the vehicle, by means of the video cameras (9) .

Inventors: BLOMQVIST KENNET, HJELMARE ANDERS, OLSSON LARS, BLOMQVIST, KENNET, HJELMARE, ANDERS, OLSSON, LARS
Applicants: BLOMQVIST KENNET, HJELMARE ANDERS, OLSSON LARS, SAAB SCANIA COMBITECH AB, BLOMQVIST, KENNET, HJELMARE, ANDERS, OLSSON, LARS, SAAB-SCANIA COMBITECH AKTIEBOLAG
Application year: 1994
Main classification: G07B15
IPC codes: G01C11, G06Q50, G07B15, G08G1